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If you're only interested in sending 8 bits, maybe a simple RX/TX setup would be better and less complicated. There are many examples available on this forum, and these examples have allowed me and...

What sensor will you be using? I ask because I have built one of these (without the amoniac gases bit) which not only works (activates relays) but allows the user to define the parameters, such as...

The problem with bankers and lawyers is that they look and smell too much like real people, so it is very difficult to differentiate between them and us.

RFID tags are one way to go for detecting...

Morning Menta,

The 877A is a bit tempremental at times. I use it for a lot of projects, and I find that some times it works under strange conditions when it shouldn't. We've established that you...

Dammit!!!! Didn't spot the MCLR pin wasn't connected in the schematic. Maybe need new glasses!!!!!!

Sounds like bad soldering or bad connections. Glad you have it sorted though. External power source making it work points to sever current loss accross your tranny/7805 circuit. Could it be your...

or your display is messed up. Checked the leads into the display?

Just out of curiosity, what is the rating on the tranny? and what was the total current draw on the circuit?

noise my friend, seems the only option at this stage.

With regard to this circuit, take the 2803 out of the circuit and try it. If it still doesn't work, it's not power related, then we can look at noise somewhere. Have you got a photo of this setup?

Actually sounds like a good project to me Roger. Let us know how you get on. How do you propose to write the data to the PIC once the IR data has been received?

Yes, serially connect the meter to +, set it to 10 Amps. Why not do the following. Use 1 7805 for the display and another 7805 for the PIC. you can place the circuits in parallel if you so wish. you...

You don't have enough current. Can't be anything else then. Do you have a multimeter? whats the current drain on the circuit?

Menta, 4.95V is good. Whats the current rating on the transformer? I can see maybe over an amp of current straight off without studying the schematic for longer than a few minutes. Perhaps there is...

That is a very interesting page Dave, and one I will be visiting again and experimenting with ASK and FSK. Just out of curiosity, ASK seems more like AM and FSK seems more like FM, but with logic 1's...

And if you weren't ungrateful you would accept help in whatever form it's offered, and thank those who take the time to work on a solution. I am following Ski's lead. as far as you are concerned, I...

I've gotta say Ted, you ask for help, and when we actually try to give it, you diss us off. Did you expect that we would drop everything and just run over to your house and make it work? I'm sorry...

Roger (from the French part of Switzerland)

What PIC are you planning on using? How are you planning on getting the update in to your cellphone? MOST phones (including Nokia) don't like to receive...

Get some breadboard and stick your PIC on that. Your circuit MAY have worked before, but solder dries up after a while. It may be worth your while re-soldering (neatly) every join you've made on that...

In the cold light of day I might just "play" with the baud rates and see if increased speed = increased distance.
What modules are you using Ski??

I have found that at 2400 and 4800 I get between 75 and 95 % first pass rate, as long as it's inverted. 1200 and 300 I may as well give up, and 9600 was only about 50% first pass rate. I'm now using...

So I have limited the actual data sent, INCLUDING SYNC bits to about 20 chars long. It works perfect over short distances (10 cms) and long distances (almost 80 meters). I am happy to share my...

So, you're switching on 5 LED's then switching them off again. That routine will run only once, and in fairness, there is in theory only half a second between the ON and OFF sequence. Do you have 5V...

I would suggest that that PIC won't carry on to the next instruction until it has finished dealing with the previous one.
IF I'm wrong I'm sure Ski will dive in and let me know in some spectacular...

RF: Manchester coding works. Very important for newbies. If you have patience, you can send large strings WITHOUT manchester coding. I also found that if you send the data INVERTED it will generally...

But it worked. That was staring me in the face. Cheers Dave, and thanks